Reversible self-sharpening plowshare.



Patented June 19, I900;

J. R. TRULL.

REVERSIBLESELF SHARPENlNG-PLOWSHARE.

(Application filed Jan. 6, 1900.)

(No Model.)

961 1170, sszs U ITED. STATES PATENT FFICE..

REVERSIBLE SELF-SHARPENING PLOWSHARE.

SPECIFICATION forming part of Letters Patent No. 652,153, dated June 19,1900.

Application filed January 6, 1900. Serial No. 5'73. (N d l.)

To all whom it may concern;

Be it known that I, JAMES RILEY TRULL, a citizen of the United States,residing at Garden Creek, in the county of Haywood and State of NorthCarolina, have invented a new and useful Reversible Self-SharpeningPlowshare, of which the following is a specification.

The invention relates to improvements in plowshares.

One object of the present invention is to improve the construction ofplowshares and to provide a simple and comparatively-inexpensive onedesigned for use on ordinary sidehill-plows and for reversiblesidehill-plows and capable of being reversed or changed from aright-hand plow to a left-hand one to bring its faces alternately at thebottom, whereby it will be sharpened as it is worn away and will obviatethe necessity of sharpening it by hand.

A further object of the invention is to lighten the construction andsimplify the means for securing a plowshare to a moldboard and enable itto be readily removed therefrom, so that it may be quickly changed froma right-hand plow to a left-hand one, or vice versa.

The invention consists in the construction and novel combination andarrangement of parts hereinafter fully described, illustrated in theaccompanying drawings, and pointed out in the claims hereto appended.

In the drawings, Figure 1 is a perspective view of a plowshareconstructed in accordance with this invention and shown applied to aright-hand moldboard. Fig. 2 is a plan view, partly in section. Fig. 3is a sectional view taken transversely of the plowshare. Fig. 4 is adetail perspective view of the plowshare, showing the opposite facethereof.

Like numerals of reference designate corresponding parts in all thefigures of the drawlngs.

1 designates a reversible plowshare consisting of an approximatelyhorizontally arranged blade extending diagonally or at an angle acrossthe front of a moldboard 2 and having its upper and lower faces of thesame shape, whereby it is adapted to be reversed to arrange it on eithera right or left hand plow and to adapt it for use on reversiblesidehill-plows. The blade, which is provided with a point or projection3, has a straight infront edge 5 is substantially triangular incross-section, the moldboard being beveled at both its upper andlowerfaces, and the point 3 projects forward and has a straight side edge,which forms the continuation of the straight edge at the inner end ofthe plowshare.

The plow share or blade is provided at its inner end with arearwardly-disposed arm or lug 6, rectangular in cross-section andfitting in a corresponding recess 7 of the adjacent edge of themoldboard. The rearwardly-dis posed arm or lug 6 is provided with acountersunk perforation 8 for the reception of a screw or bolt-9, whichprojects into a bore or opening 10, arranged at right angles to therecess 7 and intersecting a slot 11. Within the slot 11, which extendsparallel with the recess 7, is arranged a nut 12, which is en gaged bythe screw or bolt 8, and when the latter is tightened the plow share orblade is securely fastened to the moldboard and may be readily removedby simply Withdrawing the screw. The slot 11, which preferably extendsentirely throngh the moldboard, has parallel end walls which conform tothe con= figuration of the adjacent edges of the nut, whereby the latteris locked against rotation when the bolt is screwed tight.

The blade or plowshare tapers in width, its rear end 13 being narrowerthan its front end, and the said rear end is provided with a straightedge, as clearly shown in Fig. 2. The screw or bolt 8 is arranged at aslight angle to the rear edge of the blade or shaft, and with theinterlocked edges it is capable of firmly holding the plow share orblade in position.

The upper and lower faces of the plow share or blade are of exactly thesame shape, as clearly illustrated in Figs. 1 and 4 of the accompanyingdrawings, and it will be readily apparent that the said plow share orblade may be readily employed on either a right or left hand plow and iscapable of being changed from one to the other to bring its facesalternately at the top and bottom, so that they will be uniformly wornaway and the plow share or blade automatically sharpened. The plow shareor blade, which may be reversed in this manner until it is practicallyworn away, will always be sharp, and it may be constructed of a minimumamount of metal, and it is securely fastened to the moldboard by asingle bolt or screw.

Although the lug or arm 6 is shown at the inner orfront end of theplowshare only, yet it will be readily understood that such a lug or armmay be employed at the outer or rear end also, if desired.

What is claimed is- 1. A plowshare consisting of a blade designed to bearranged across the front of a moldboard in approximately a horizontalposition, and having similar upper and lower faces, whereby it isadapted to be reversed and changed from a right-hand plow to a lefthandplow, an arm extending from the back of the blade, and means forsecuring the arm to the moldboard, substantially as described.

2. A plowshare consisting of a blade designed to be arranged at an angleacross the front of a moldboard in approximately a horizontal positionand having similar upper and lower faces, whereby it is adapted to bereversed and changed from a right-hand plowto a left-hand plow, saidblade being provided at its rear edge with means for interlocking itwith a moldboard, an arm extending from the back of the blade, and afastening device for securing the arm to the moldboard, substantially asdescribed.

3. In a deviceof the class described, the combination with a moldboardprovided at its front with an oppositely-beveled edge and having arecess at one side, said moldboard being provided adjacent to the recesswith a slot and having an opening intersecting the same, of a reversibleplowshare having a grooved rear edge to receive the beveled edge of themoldboard and provided with a rearwardly-extending arm fitting in thesaid recess, said plowshare having similar upper and lower faces andadapted to be changed from a right-hand plow to a left-hand plow, a boltpassing through the arm, and a nut arranged in the said slot and engagedby the bolt, substantially as described.

In testimony that I claim the foregoing as my own I'have hereto affixedmy signature in the presence of two witnesses.

JAMES RILEY TRULL.

Witnesses:

CHARLES M. TRULL, JOHN M. CAMPBELL.

